cop off with vs take up with

cop off with

verb
  • To successfully engage the company of someone for a period of time. 

take up with

verb
  • To form a close relationship with (someone). 

  • To begin living together with; to lodge with. 

  • Used other than figuratively or idiomatically: see take, up, take up, with. 

  • To become interested in (something). 

How often have the words cop off with and take up with occurred in a corpus of books? (source: Google Ngram Viewer )